but it does not work because datepicker and globalize plugin use two format different.

I want the date with 2 digits for the month, 2 digits for the day and 4 digits for the year, so in jquery the date format must be "dd/mm/yy". But globalize use a different date format:
en-Us -> M/d/yyyy
it-IT -> dd/MM/yyyy

But this only sets the date pattern, yes? Localization requires also getting all the month names, week names, etc. All that data is in the globalize.culture.xx-XX.js files, but is there a way to use it?
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Neil LaslettSep 18 '13 at 8:56

In the early days of Globalize (called back then jQuery Globalize) there was specifically patched version of Datepicker available.
Frankly, I don't think it is usable anymore, but you may try to apply the same modifications to current version and the problem will be resolved. This could be done quite easy with a diff command available with many Unix-like systems (and on Windows via Cygwin for example).

Edit: API

I think it is at least good to mention, that Datepicker is offering rich API.
You can use to tailor down Datepicker's Localization. However, when it comes to date format, I am afraid that you would be forced to use some replacement to remove "excessive" y's from year field. That's something I would prefer not to do, instead I would patch Datepicker, as suggested previously, but...